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Graphene filter composite membrane and preparation method thereof

A graphene and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of non-degradable and easy-to-foul membranes, and achieve simple operation, strong controllability, and improved interception performance Effect

Active Publication Date: 2017-08-04
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the membrane technology has the following problems: the inability to degrade the refractory pollutants, the high concentration of refractory pollutants in the effluent due to concentration polarization, and the membranes used are easy to foul, etc.

Method used

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  • Graphene filter composite membrane and preparation method thereof
  • Graphene filter composite membrane and preparation method thereof
  • Graphene filter composite membrane and preparation method thereof

Examples

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preparation example Construction

[0033] The invention discloses a preparation method of a graphene filter composite membrane, comprising:

[0034] Carboxylated graphene oxide is filtered onto the membrane support layer by suction filtration or cross-flow filtration to form a composite membrane support layer;

[0035] The composite membrane support layer formed in the above steps is used to filter the ferric chloride solution, and the electro-Fenton catalyst layer containing ferrous iron is reduced to form an electro-Fenton catalytic layer, so as to complete the preparation of the graphene filter composite membrane.

[0036] Since the electro-Fenton catalytic layer contains ferrous compounds, it has a certain interception effect on refractory pollutants, and can decompose refractory pollutants in situ, thus solving the problem that membrane technology cannot reduce the toxicity of refractory pollutants , and reduce membrane fouling. At the same time, since there is a composite membrane support layer under the...

Embodiment 1

[0058] Such as figure 1 As shown, a flat polytetrafluoroethylene (PTFE) microfiltration membrane with a pore size of 0.45 μm was used as the membrane support layer. Specifically include the following steps:

[0059] Step 1. Under the conditions of room temperature 25°C, transmembrane pressure difference 0.2MPa, and cross flow rate 1.5L / min, load 2.02g / L GO dispersion on the membrane support layer, and dry it at 40°C.

[0060] Step 2, carry out electrochemical reduction to the GO membrane of above-mentioned oven dry, wherein, use the NaCl solution of 0.5M as electrolytic solution, react 24h, control reaction potential at-1.0V (relative to reference electrode Ag / AgCl), obtain RGO conductive layer.

[0061] Step 3. Prepare carboxylated GO solution, load the carboxylated GO solution on the RGO conductive layer by cross-flow filtration method, the dosage is 0.1g / cm 2 , and then filter sodium hydroxide solution, sufficient ultrapure water and ferric chloride solution through the ...

Embodiment 2

[0072] This example proposes a method for preparing a graphene filtration composite membrane, which is basically the same as that of Example 1, the only difference being that the membrane support layer of this example uses a PTFE microfiltration membrane with a pore size of 0.22 μm. The effect of the graphene filtration composite membrane obtained in this embodiment to degrade pollutants is basically the same as that in Example 1.

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Abstract

The invention provides a preparation method of a graphene filter composite membrane. The preparation method comprises the following steps of: filtering carboxylated graphene oxide to a membrane supporting layer by means of a suction filtration method or a cross flow filtration method to form a composite membrane supporting layer; and filtering a ferric chloride solution by using the formed composite membrane supporting layer, and performing reduction to form an electro-Fenton catalytic layer comprising a ferrous compound to prepare the graphene filter composite membrane. As the electro-Fenton catalytic layer comprises the ferrous compound which has a certain interception performance on refractory pollutants and can decompose the refractory pollutants in situ, the problem that the toxicity of the refractory pollutants cannot be reduced by means of a membrane technology is solved, and the membrane pollution is alleviated. Meanwhile, as the membrane supporting layer is arranged below the electro-Fenton catalytic layer, and in a process of filtering secondary effluent, the refractory pollutants can be enriched to a certain degree, so that the degrading rate of the electro-Fenton catalytic layer on the refractory pollutants can be further increased.

Description

technical field [0001] The invention belongs to the technical field of advanced sewage treatment, and more specifically relates to a graphene filter composite membrane and a preparation method thereof. Background technique [0002] Sewage recycling can alleviate water shortage and reduce sewage discharge, which has important economic and ecological benefits. However, the residual low concentration of refractory pollutants (such as florfenicol) in the secondary effluent of sewage treatment plants has potential threats to the natural environment and human health, and has become an important factor limiting the reuse of sewage. Due to the characteristics of low concentration and poor biodegradability of refractory pollutants in sewage, the conventional sewage treatment process with biological treatment as the core unit has very limited removal effect, and it is difficult to meet the requirements of sewage reuse. Therefore, the development of efficient advanced treatment techno...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/02B01D67/00C02F1/44C02F1/461C02F1/72
CPCB01D67/0039B01D69/12B01D71/021C02F1/444C02F1/4672C02F2305/026
Inventor 王爱杰夏雪姜雯丽韩京龙
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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